Carbazol-sulfonic acids and process of making same.



' PATE T omen.

ALBRECHT QCHMIDI, GUSTAV KBGNLEIN, AND ERNST BUNNE, onnocns'r-on-mm- MAIN, GERMANY, ASSIGKOBS TO FABBWERKE VORM. MEIS'IER LUCIUS & BRfl'NmG, 0F HMBBT-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

QARBA ZOL-SULFONIC ACIDS AN D PROCESS OF MAKING SAME.

No Drawing.

To all whom tt may concern:

Be it known that we, ALBRYCHT Scum, Ph. D., chemist, Gos'rav Knoxnnm, Ph. D.,

chemist, and EuNs'r Roman, Dr. Ing., chem-.

acid) to act upon carbaz'ol, etc., in an indifferent solvent,- a monosulfonic acid of said bodies is obtained corresponding to the rg imeral formula:

X stands for the series: H, methyl,

ethyl etc; and R for a cation, such as H, if, Na, NI etc. Said monosulfonic acid constitutes a valuable parent material for the manufacture of dyestufl's.

The followin example illustrates our invention: 16.7 ki os of carbazol, or the corresponding quantity of methyl-carbazol or ethyl-carbazol, are finely divided in 15-20 times the uantity of ,nitrobenzene and gradually mixed with 9.5- kilos of fuming sulfuric acid. containing 20% of sulfuric anhydrid, while cooling. This mixture is stirred for some hours at a somewhat higher temperature, whereupon the nitrobenzene is shaken outwith water and the sulfonic acid isolated in the usual manner from the aqueous solution.

The sodium salt of the carbazol-sulfonic acid Q12 1( 8 is not very readily soluble in water and crystallizes therefrom as colorless, brilliant leaflets, the sodium salts fromthe alkyl-car- 'bazols being readily soluble.

These carbazol-sulfonic acids are soluble in water; when combined with p-nitrosophenol and concentrated sulfuric acid, they Specification 01 Letters Patent.

Application flledAprll 24. 1813. Serial No. 763,897.

- are remarkable or their solubility in watengif, 'wherem y dissolve with a blue color, the

'we claim is:

Same, of which the wherein stands for the series: H, l

Patented Feb. 16, 1915.

yield blue indo henolsulfonic acids whichiil solutions in aqueous alkalis or in alcohol being of a reddish-violet color.

Having now described our invention wha 1. The process of manufacturing carba zol-sulfon1c acids, being substantially car bazol-monosulfonic'acids of the general formule.

' H T D- 8 wherein X stands for the series: H, methyl, ethyl, alkyl and R for a cation, which consists in treating a carbazol with strong sulfuritc acid in presence of an indifferent sol ven 2. As newproducts, the carbazol-sulfonic acids of the general formula: *"f

ethyl, alkyl; and R for a cation,.beiag T-"o tainable by treating a carbazol sulfuric acid in (presence of an indiuepenti solvent, said pro uct'being soluble inivate'r and yielding with p-nitroso' henol and concentrated sulfuric acid in o henolsulfonic acids, which are soluble in wa with a blue color, in aqueous alkalis with a reddish-vie: let color. r

3. As a new product, the carbazol sulfonic acid, bein substantially acarbazol-monosulfonic aci of the formula:

H -S .H soluble in water, formin a sodium salt which crystallizes as color ess brilliant leaflets from its a ueous solution and yielding, when combine with nitroso henol and con- 5 centrated sulfuric acid, a blue indophenolsulfonic acid which is solublein water with a blue color, in dilute alkalis and in alcohol with a reddish-violet color.

In testimony whereof, we afiix our signatures in presence of two witnesses.

ALBRECHT SCHMIDT. GUSTAV ERNST RUNNE, Witnesses:

JEAN GRUND, CARL Gavan. 

